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Based upon the vacuum response in observation probes during the first VET, the radius of <br /> influence for soil vapor extraction for the tested soil zone will be estimated. In addition, the <br /> relationships between vacuum and flow will be assessed, and hydrocarbon mass removal rates <br /> will be estimated based upon the measured influent extraction flow rates and UVOC <br /> concentrations. <br /> Field work for the vapor extraction testing will be conducted in accordance with the field <br /> procedures presented in Appendix E and the Health and Safety Plan presented in Appendix F. <br /> DATA EVALUATION AND REPORT PREPARATION <br /> The results of the soil vapor probe sampling and the vapor extraction pilot testing will be <br /> evaluated and interpreted in context with the existing on-Site soil conditions and the <br /> hydrogeologic setting. A report documenting the probe installation and sampling, with results <br /> and recommendations, will be prepared and submitted to the RWQCB. The report will include <br /> tabulated VET data, laboratory analytical data, boring/probe construction logs, radius of <br /> influence estimates, mass removal estimates, laboratory reports and recommendations. <br /> SCHEDULE <br /> FREY is prepared to commence work with written approval of this workplan by the RWQCB. <br /> It is anticipated that permits can be obtained approximately one month following workplan <br /> approval. It is estimated that the field work for the installation and sampling of soil vapor probes <br /> can be completed approximately two weeks following the receipt of permits, but is dependent <br /> upon the availability of laboratory-supplied Summa cannisters. It is anticipated that the VET can <br /> be conducted approximately one to two weeks following completion of vapor probe sampling, <br /> but is dependent upon mobile vapor extraction unit availability. It is anticipated that a report <br /> documenting the results of the vapor probe installation and sampling and the vapor extraction <br /> pilot testing will be submitted to the RWQCB approximately eight weeks following the <br /> completion of field work. Overall, it is anticipated that a report can be issued to the RWQCB <br /> approximately four months following workplan approval. <br /> Should you have any questions, please contact us at (949) 723-1645. <br /> Sincerely, <br /> FREY Env' '� d Inc. <br /> p(LOFESStil <br /> O �P�p � c <br /> 1� L� tn.G r� F <br /> f� No.1500 1? 2 <br /> 0 <br /> Ex- t�7�" y C 58183 m A <br /> ey e OFC�y Ed Rands �oFc1 �F e <br /> Pri ipal Certi ie Senior Project En <br /> Engineering Geologist P.E. #58183 <br /> C.E.G. #1500 <br /> FREY Environmental, Inc. 9 1092-01 <br />